- Future Students
- Current Students
- Faculty & Staff
Rifabutin and sparfloxacin but not azithromycin inhibit binding of Mycobacterium avium complex to HT-29 intestinal mucosal cells.
|Title||Rifabutin and sparfloxacin but not azithromycin inhibit binding of Mycobacterium avium complex to HT-29 intestinal mucosal cells.|
|Publication Type||Journal Article|
|Year of Publication||1994|
|Authors||Bermudez LE, Young LS, Inderlied CB|
|Journal||Antimicrobial agents and chemotherapy|
|Date Published||1994 May|
|Keywords||Anti-Infective Agents, Azithromycin, Bacterial Adhesion, Fluoroquinolones, Humans, Intestinal Mucosa, Mycobacterium avium Complex, Mycobacterium avium-intracellulare Infection, Quinolones, Rifabutin, Tumor Cells, Cultured|
Organisms of the Mycobacterium avium complex (MAC) cause disseminated disease in patients with AIDS, and evidence points to the gastrointestinal tract as the major route of infection. Since MAC can bind to and invade intestinal mucosal cells, we examined whether subinhibitory concentrations of antibiotics which have anti-MAC activity in vitro affect the interaction between MAC and HT-29 intestinal mucosal cells. MAC isolates were exposed to subinhibitory concentrations of rifabutin (MIC, 2.6 micrograms/ml), sparfloxacin (MIC, 8.4 micrograms/ml), or azithromycin (MIC, 32 micrograms/ml) for 30 to 120 min, washed, and incubated with HT-29 cell monolayers for 2 h at 4 degrees C. HT-29 cell monolayers were then washed to remove unbound bacteria and were subsequently lysed. The number of MAC isolates that bound to the HT-29 cells was determined by plating the cell lysate onto 7H10 agar. Preincubation of the MAC isolates with rifabutin at concentrations of 1 and 2 micrograms/ml reduced MAC binding to HT-29 cells by 80 to 90%, while MAC exposed to sparfloxacin at 1 and 7 micrograms/ml inhibited binding by 77 to 93%. Azithromycin at concentrations of 2, 10, and 30 micrograms/ml had no effect on MAC binding to HT-29 cells. Inhibition of MAC binding to the gastrointestinal mucosa may be one underlying mechanism for the prophylactic effects of rifabutin and quinolones.
|Alternate Journal||Antimicrob. Agents Chemother.|